Ibn Mas’ud on Knowledge: Humility is a third of all knowledge

Ibn Al-Qayyim reported: Ibn Mas’ud, may Allah be pleased with him, said, “If you are asked about something you do not know, then say: I do not know. Verily, saying so is a third of knowledge.”

And Ibn Mas’ud said, “I say things that are my opinion. If they are correct, then they are from Allah. If they are mistaken, then they are from myself and from Satan; Allah and His Messenger are innocent of it.”